Neue ?-Lactam-Antibiotika. �ber Derivate der 3-Hydroxy-7-amino-ceph-3-em-4-carbons�ure. Modifikationen von Antibiotika, 10. Mitteilung [1]
作者:Riccardo Scartazzini、Hans Bickel
DOI:10.1002/hlca.19740570705
日期:1974.11.6
Abstract3‐Hydroxy‐ceph‐3‐em‐esters 5 a–c, versatile intermediates for the preparation of new β‐lactam antibiotics, were obtained by ozonolysis of the corresponding 3‐methylidene‐esters 3 a–c. Reduction and elimination gave the 3‐unsubstituted ester 13; derivatives 16 a–c and 20–22 resulted from O‐alkylation. The 3‐methoxy‐esters 16 a–c were converted into the corresponding acids 23 a–d. Several other transformations of the β‐ketoester system are described.